RU15510U1 - CHIMNEY - Google Patents

Abstract

A chimney containing a bearing reinforced concrete shell and installed with the formation of a ventilated channel a height-extending exhaust pipe, characterized in that the links of the lining of the exhaust pipe are interconnected by annular metal inserts resting on the console of the supporting shell and forming a gap with it, with the inserts in the upper its parts have a porous surface.

Description

CHIMNEY

The invention relates to the design of chimneys of thermal power plants and industrial enterprises, and can be used in the design, construction and reconstruction of reinforced concrete chimneys with a ventilated air channel between the bearing shell and the lining of the exhaust pipe.

Known chimney 1 for removing gases, containing a bearing reinforced concrete shell, height-lining of the exhaust pipe, a vented channel between them and adjacent diametrically opposed ducts adjacent to the lining. In this case, the ventilated channel in the lower part of the pipe is connected by an air duct to the air heater.

In a known device, flue gases are transported through the inside of the flues and the lining. Heated air is supplied to the ventilated channel from the atmosphere through the duct, which, passing through the ventilated channel, removes harmful components and creates the necessary temperature difference in the lining of the exhaust pipe.

A disadvantage of the known pipe is the inability to maintain the required temperature difference in the lining over its entire height due to air cooling in the ventilated channel.

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In addition, additional energy is expended in this pipe to heat the air before it is fed into the ventilated channel (for example, steam from steam turbine offsets) and the corresponding additional fuel consumption in the station.

The closest technical solution to the claimed utility model is a chimney 2 containing a reinforced concrete shell, a height-lining gas outlet trunk and a ventilated channel between them, while the lining in the lower part of the pipe is made of crack-resistant material with low thermal resistance, for example, sheet metal .

In this pipe, the flue gases move along the inner part of the lining and the section made of metal. From the outside, the metal portion of the lining is washed with atmospheric air, which is heated to the required temperature due to the heat of the exhaust gases and enters the ventilated channel. The advantage of this pipe over the known one is to reduce energy costs for heating the air entering the ventilated channel of the pipe.

The disadvantage of this pipe is the inability to maintain the required temperature difference over the entire height of the lining due to a drop in air temperature (heat loss through the reinforced concrete shell) in the air duct and an increase in temperature difference

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on the lining of its height. In addition, such designs do not protect the lining from corrosive destruction by aggressive flue gases.

The technical result is achieved in that in a chimney containing a bearing reinforced concrete shell and installed with the formation of a ventilated channel, the height-lining of the exhaust pipe is installed, the links of the lining are interconnected by lobular metal inserts, resting on the console of the reinforced concrete barrel and forming a gap with it, while the upper part of the insert has a porous surface.

The technical result is provided by maintaining an acceptable temperature difference at all links of the lining by constantly heating the air in the ventilated channel in height through the metal inserts due to the heat of the exhaust gases. At the same time, a decrease in the temperature of the flue gases and an increase in the air temperature in the channel provide an allowable temperature difference in the lining within each unit. In addition, the connection of the links of the lining with metal inserts with a certain porosity in its upper part allows the exit of part of the air from the channel into the wall layer of the lining, protecting the entire surface of the link from the aggressive effect of flue gases, and also reduces

aerodynamic resistance of the ventilated channel, and as a result, increases the efficiency of the installation.

Such signs as the connection of the links of the lining of the exhaust pipe with metal annular inserts resting on the console of the reinforced concrete barrel and forming a gap with it, and in the upper part of the insert have a porous surface in the known technical solutions, are absent and are claimed for the first time.

The proposed utility model has industrial applications and can be used on chimneys with a ventilated channel between the bearing reinforced concrete barrel and the lining of the exhaust pipe.

In figure 1. shows the proposed chimney, figure 2. section AA in figure 1.

The proposed chimney contains a bearing reinforced concrete shell 1, installed inside with the formation of a ventilated channel 2, a height-lining 3 of the exhaust pipe. The links of the lining 3 are interconnected by annular metal inserts 4, resting on the console 5 of the bearing shell 1 and forming a gap with it 6. The upper part of the insert 4 has a porous surface with holes 7.

The proposed chimney works as follows.

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-g Exhaust gases move along the inside of the lining 3 of the exhaust pipe. The ventilated channel 2 receives pre-heated atmospheric air. Passing one link in the liner 3 of the exhaust shaft, air enters the gap 6 between the metal insert 4 and the console 5, where it is additionally heated by the heat of the exhaust gases through the surface of the insert, part of the air through the holes 7 enters the wall layer. The upper link of the liner 3, displacing aggressive gases from the inner surface along the entire length of the link. The remaining part of the air enters the upper link of the ventilated channel 2. After passing the first link of the lining 3, part of the air enters the next link through the metal inserts 4, and part through the holes 7 into the wall layer of the lining of the higher link, etc. At the same time, temperature stresses and corrosion destruction of the lining are reduced over its entire height due to a certain decrease in the temperature of the flue gases and maintenance of the air temperature in the channel at a constantly set level, as well as due to a decrease in its direct contact with aggressive flue gases. In addition, the connection of the links of the lining 3 with metal inserts 4 increases the cross section for the passage of air on the consoles 5 of the bearing shell 1. This reduces the aerodynamic resistance of the ventilated channel 2, which increases the efficiency of the installation.

Thus, the use of a utility model for stepwise heating of air in a ventilated channel due to the heat of the flue gases makes it possible to maintain the necessary temperature difference in the lining along the entire height of the pipe, preventing its destruction from temperature deformations and corrosion processes.

Head of Patent Department: / / V.P. Yablokov

Authors: Yu.V. Salov

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V.V. Varnashov V.A. Semashko V.V. Velikorossov M.Yu.Salova V.G. Sokolov

USEFUL MODEL FORMULA

A chimney containing a bearing reinforced concrete shell and installed with the formation of a ventilated channel a height-extending exhaust pipe, characterized in that the links of the lining of the exhaust pipe are interconnected by annular metal inserts resting on the console of the supporting shell and forming a gap with it, with the inserts in the upper its parts have a porous surface.

Sources of information taken into account during the examination:

1.Richter L.A. Gas-air tracts of thermal power plants. - 2nd ed., Revised. and add. - M .: Energoatomizdat, - 1984, p. 264.

2. USSR Certificate of Authorship No. 340764, Bull. №, 1972. Head of the patent department: // Г} / V.P. Yablokov

Authors: Yu.V. Salov

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V.V. Varnashov V.A. Semashko V.V. Velikorossov M.Yu.Salova V.G. Sokolov

Claims (1)

A chimney containing a bearing reinforced concrete shell and installed with the formation of a ventilated channel a height-extending exhaust pipe, characterized in that the links of the lining of the exhaust pipe are interconnected by annular metal inserts resting on the console of the supporting shell and forming a gap with it, with the inserts in the upper its parts have a porous surface.